What is LEGAION and how is it different from Harvey AI?

LEGAION is the world's #1 Legal Intelligence Platform with the only built-in Verifier Engine™. Unlike Harvey AI which generates responses without verification and can hallucinate, LEGAION audits every single claim with citations from case law, statutes, and regulatory databases. This means you get accurate, verifiable legal insights with zero AI hallucinations - critical for malpractice prevention.

Is LEGAION better than Harvey AI for contract review?

LEGAION offers significant advantages over Harvey AI for contract review. Our Verifier Engine™ cross-references every clause against legal databases and provides source citations. While Harvey AI generates plausible-sounding analysis that may contain errors, LEGAION verifies each finding with actual legal authority. AmLaw 100 firms report 40% fewer review cycles after switching from Harvey AI to LEGAION.

How does LEGAION compare to CoCounsel by Thomson Reuters?

LEGAION surpasses CoCounsel with our unique Verifier Engine™ technology and Cross-Border Shield for international transactions. While CoCounsel integrates with Westlaw, LEGAION works with all major legal databases and provides citation verification. LEGAION also offers Autonomous AI Agents for negotiation and Judge Profiling analytics that CoCounsel lacks.

Can LEGAION replace Harvey AI for my BigLaw or AmLaw 100 firm?

Yes, LEGAION can fully replace Harvey AI with significant advantages. We offer AI contract analysis, legal research, document drafting, M&A due diligence, and autonomous negotiation agents — all with citation verification. LEGAION is trusted by AmLaw 100 firms, Magic Circle practices, and European law firms who switched from Harvey AI for measurable accuracy: every citation is verified against ISAP, EUR-Lex and USPTO by Verifier Engine (P.454531) before delivery.

What is LEGAION pricing compared to Harvey AI and CoCounsel?

LEGAION offers competitive pricing starting with a 14-day trial (card required, auto-converts to paid subscription, cancel anytime). Professional plans start at $299/user/month. Unlike Harvey AI's enterprise-only pricing or CoCounsel's bundled costs, LEGAION has transparent pricing for solo practitioners, mid-size firms, and enterprise clients. Firms typically save 30-50% compared to Harvey AI while getting superior citation verification.

Is LEGAION GDPR compliant and what is its certification status for European law firms?

LEGAION runs exclusively on EU-only infrastructure that is SOC 2 Type II and ISO 27001 certified at the hosting layer. The product itself maintains GDPR/RODO operational compliance, EU AI Act readiness, and NIS2 alignment. A SOC 2 Type II audit at the company level (Aidvocates, Inc.) is on the roadmap and was initiated in 2027. All data is encrypted end-to-end with Private Vault zero-knowledge storage. We support 15+ languages including German, French, Spanish, Italian, Polish, and Japanese.

Does LEGAION support M&A due diligence and cross-border transactions?

LEGAION excels at M&A due diligence with features competitors lack. Deep X-Ray analyzes contracts for 200+ risk categories, Cross-Border Shield identifies US/EU/UK/APAC regulatory conflicts, DealRoom provides secure collaboration, and Verifier Engine™ ensures every finding is backed by legal authority. Perfect for cross-border transactions where accuracy is critical.

What AI features does LEGAION offer that Harvey AI doesn't have?

LEGAION offers unique AI features unavailable in Harvey AI: (1) Verifier Engine™ - citation verification for every claim, (2) Autonomous Negotiation Agents - AI-to-AI negotiation, (3) Judge Profiling - judicial tendency analytics, (4) Cross-Border Shield - multi-jurisdiction compliance, (5) Witness Prep AI - deposition preparation, (6) LEGAION Predict™ - 94% accurate case outcome prediction, (7) DealRoom - secure M&A collaboration.

How accurate is LEGAION compared to other legal AI tools?

LEGAION achieves 99.7% citation accuracy with our Verifier Engine™ - the highest in the industry. Unlike Harvey AI or CoCounsel which can generate plausible-sounding but incorrect information, every LEGAION response is verified against authoritative sources. Our LEGAION Predict™ achieves 94% accuracy in case outcome predictions. We publish accuracy metrics transparently.

Can LEGAION integrate with existing law firm software?

Yes, LEGAION offers comprehensive integrations including Microsoft 365, Google Workspace, Microsoft 365, Google Workspace and Clio today; iManage and NetDocuments connectors on the H2 2026 roadmap. We provide REST API and GraphQL access, webhooks for automation, and SSO/SAML for enterprise authentication. White-label options are available for large deployments.

Technical comparison

Verifier Engine vs typical competitor approaches

Below — how LEGAION's Verifier Engine compares to two dominant approaches: generic legal AI (typical LLM-only platforms) and research-platform AI (curated US/UK research databases).

Most legal-AI generates plausible fiction. Our engine will not release a citation it could not verify against 112 structured sources — before the answer reaches the lawyer. A comparison across 8 dimensions critical to law-firm work.

★ Verifier

LEGAION

Każdy cytat weryfikowany do źródła pierwotnego przed odpowiedzią.

Warstwy dokumentów na lnianym biurku — generyczne legal AI

Generic legal-AI

Typical LLM output without a deterministic verification layer — citations remain unchecked at delivery.

Laptop z dokumentem prawnym — platformy research AI

Research-platform AI

Curated databases optimised for US/UK research, with soft warnings rather than a hard publication gate.

Scroll horizontally to see all columns

Dimension

LEGAION★ Verifier

Generic legal-AI

Category benchmark

Research-platform AI

Category benchmark

Built-in Verifier Engine

Every citation cross-checked against the primary source (ISAP, EUR-Lex, USPTO) before it reaches the user.

Built-in · 335 cycles / day

None — raw LLM output

External plug-in · manual setup

Structured sources

112 sources indexed with metadata (jurisdiction, parent act, date, citation key) — not scrape-and-pray.

112 sources · 46 jurisdictions

Web scraping without context

Curated DBs limited to US/UK

Time-Travel Corpus

Query the state of the law on any historical date (SHA-256 hashed snapshots).

24 snapshots · `get_corpus_at_date`

Current state only

None — manual versioning

Legal determinism

Hallucination block: no source = no answer. Confidence calibration + OOD detection.

Hard-fail without citation

Generates plausible fiction

Soft warning · still hallucinates

Atomic clauses

Each clause = a self-contained unit with metadata, not a monolithic DOCX template.

20 clauses · LEGAION Gate

Static Word templates

Clause library without metadata

Zero-Retention E2EE

AES-256-GCM, data encrypted in the browser, no query logs after the audit session.

Trusted Devices · zero retention

Training on client data

TLS in transit · plain at rest

Multi-jurisdiction native

PL, EU, US, UK, CA (+3), AU (+6), SG, MENA, APAC — in a single workspace, one Gate.

46 jurisdictions · 11 subdivisions

Single-jurisdiction · US-only

US + UK + AU (separate SKUs)

Audit trail with hash

Every AI decision carries a SHA-256 chain: prompt → source → result → corpus version at the given date.

Forensic-grade · admissible

No audit

Conversation log without hash chain

Pełne wsparcie produkcyjne

Częściowe / wymaga konfiguracji

Brak / nie obsługiwane

Stan: produkcja · 8 wymiarów krytycznych

Konsekwencja praktyczna

Prawnik dostaje pismo, w którym każdy cytat ma kliknięcie do źródła pierwotnego z datą obowiązywania i hashem korpusu. Bez Verifier Engine ten sam prawnik spędza 40–90 minut na ręcznej kontroli każdej generacji — albo, gorzej, jej nie robi.

Dalsza lektura · LEGAION vs Generic legal AI (Harvey, Spellbook)

Porównujesz LEGAION z Generic legal AI (Harvey, Spellbook)? Pełny ranking zestawia 8 platform AI dla prawników w 12 kategoriach — od cytowań po jurysdykcję. Best AI Tools for Lawyers in 2026 — verified comparison →

Dalsza lektura · LEGAION vs Research-platform AI (CoCounsel, Lexis+ AI)

Porównujesz LEGAION z Research-platform AI (CoCounsel, Lexis+ AI)? Pełny ranking zestawia 8 platform AI dla prawników w 12 kategoriach — od cytowań po jurysdykcję. Best AI Tools for Lawyers in 2026 — verified comparison →

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Legal Disclaimers

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LEGAION delivers verified facts (Hard Facts) and auditable conclusions (Derived Claims). Outputs depend on the quality of inputs and the freshness and availability of verified legal sources (ISAP, EUR-Lex, KRS, USPTO). The platform does not provide legal advice — decisions remain with a licensed attorney.

Hard Facts (HF)

Verified against official publications.

Derived Claims (DC)

Conclusions with a documented evidentiary chain.

Opinion Statements (OS)

Clearly labeled — never presented as fact.

Professional legal judgment and client representation remain the exclusive domain of licensed attorneys. LEGAION augments — it does not replace — qualified legal counsel.

Full availability terms (guaranteed uptime threshold pending — public status page coming soon), citation verification and liability limits:

Trust & Compliance View full SLA